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승모판막협착증의 평가방법으로서의 연속파 Doppler 심초음파도와 심도자법의 비교연구
김승관(S . G . Kim),박옥규(O . K . Park),강정채(J . C . Kang),박종춘(J . C . Park),정명호(M . H . Jeong),양승진(S . J . Yang),신순철(S . C . Shin),박상진(S . J . Park) 대한내과학회 1987 대한내과학회지 Vol.33 No.3
N/A In order to evaluate the feasibility of the noninvasive continuous wave Doppler (CWD) echocardiographic technique in evaluating transmitral pressure gradient and the effective mitral valve area, the 17 patients with pure or dominant mitral stenosis were examined by CWD echocardiography and by cardiac catheterization technique. By CWD technique mean and peak transmitral pressure gradient were measured as 9.5±4.0 mmHg, 13.9±4.9mrnHg respectively, and the effective mitral valve area was calculated as 0.62±0.16 cm², while by standard fluid filled catheter system the mean diastolic pressure gradient between the pulmonary capillary wedge position and the left ventricle was measured as 12.2±4.1mmHg, and effective mitral valve area by Gorlin and Gorlin formula was calculated as 0.66±0,39 cm. Each of the mean and peak diastolic pressure gradient by CWD was significantly correlated with the pressure gradient measured by cardiac catheterization technique (r=0.61, r=0,55, p<0.05, p<0.05, repectively). Effective mitral orifice areas measured by either of the technique were well correlated (r=0.73, p<0.02). We concluded that noninvasive CWD technique could be an alternative method to the cardiac catheterization in quantitating the severity of mitral stenosis.
최준혁(J. H. Choi),함영복(Y. B. Ham),조원용(W. Y. Cho),박상진(S. J. Park) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
As the water hydraulics is more and more highlighted in wide applications, many varieties of research on design, materials and manufacturing methods of water hydraulic components have been carried out. Especially, the water hydraulic piston pump used to be the subject of study in relation to its tilting cam drive mechanism. However, in spite of same operating mechanism with various relative sliding parts, the water hydraulic axial piston pump have more friction and leakage than oil hydraulic one because of lower viscosity and poor lubricated condition by using tap water as working fluid. Therefore, in order to reduce the friction and leakage, rod type pistons and Birfield joint as a constant velocity drive of the tilting cam are adopted. In this paper, we have designed the tilting cam drive mechanism consist of rod type pistons and Birfield joint, and analyzed the drive characteristics of it.